604 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



juice of the plant sometimes gets upon the lips and faces of feeding animals 

 and causes the hair to fall out. If it comes into contact with their eyes it pro- 

 duces severe inflammation and even blindness. 



26. Euphorbia pllcata S. Wats. Proc. Amer. Acad. 21: 438. 1886. 

 AJclema pHcata Millsp. Field Mus. Bot. 2: 417. 1916. 



Chihuahua and Sonora to Jalisco ; type from Hacienda San Miguel, south- 

 western Chihuahua. 



Shrub, 1.5 to 2.5 meters high, with glabrous branches ; leaves petiolate, 2.5 

 to 10 cm. long, obtuse ; involucres in terminal cymes or axillary clusters ; ap- 

 pendages of the glands orbicular, entire or crenulate, white; capsule glabrous. 

 " Candelilla china" (Sinaloa). 



In Sinaloa the juice is said to be used in very small doses as a purgative. 



27. Euphorbia colletioides Benth. Bot. Voy. Sulph. 163. 1844. 

 Euphorbia padifoUa T. S. Brandeg. Univ. Calif. Publ. Bot. 6: 54. 1914. 

 Aklema colletioides Millsp. Field Mus. Bot. 2: 416. 1916. 



Sonora to Oaxaca ; type from Acapulco, Guerrero. 



Shrub, about a meter high, with glabrous stems ; leaves slender-petiolate, 3 to 

 6 cm. long, obtuse or acute, pale beneath; involucres numerous, in broad termi- 

 nal cymes ; appendages of the glands white, semiorbicular ; capsule glabrous. 



It is probable that E. ligustrina Boiss.,^ described from Mexico, is a synonym, 

 but it is desci-ibed as having ovate appendages. 



DOUBTFUL SPECIES. 



Euphorbia rossiana Pax, Repert, Sp. Nov. Fedde 8:162. 1910. Type from 

 Zapotitlan, near Tehuacan, Puebla. The leaves are not described. 



2. PEDILANTHUS Neck. Elem. Bot. 2: 354. 1790. 



Reference: Millspaugh, Field Mus. Bot. 2: 353-371. 1913. 



Shrubs with fleshy branches, the juice milky; leaves alternate, deciduous; 

 flowers monoecious, small, surrounded by an oblique involucre; fruit a 3-lobate 

 capsule. 



The following vernacular names are reported for plants of the genus whose 

 specific determination is doubtful : " Perico " (Durango) ; " aymoz " (Chiapas) ; 

 " tamaulipa " (Veracruz). 



Involucre hood-shaped, the appendix larger than the tube 1. P. finkii. 



Involucre shoe-shaped, the appendix smaller than the tube. 

 Lobe of the appendix entire. 



Staminate pedicels pubescent, the pistillate ones glabrous. 



2. P. tithymaloides. 

 Staminate and pistillate pedicels glabrous. 



Leaves glabrous 3. P. parasiticus. 



Leaves pubescent. 



Glands of the appendix 4 4. P. pringlei. 



Glands 2 5. P. campester. 



Lobe of the appendix bipartite or tripartite. 

 Lobe of the appendix tripartite. 



Divisions of the appendix all on one plane 6. P. itzaeus. 



Divisions of the appendix on diflferent planes, 2 of them superior and one 

 inferior 7. P. peritropoides. 



'Cent. Euphorb. 22. 1800. 



